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JOURNAL OF NATURAL RESOURCES >

2011 , Vol. 26 >Issue 12: 2072 - 2087

DOI: https://doi.org/10.11849/zrzyxb.2011.12.007

Resources Ecology

The Variation Characteristics of Soil Organic Carbon of Typical Alpine Slope Grasslands and Its Influencing Factors in the "Three-River Headwaters" Region

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  • 1. Institute of Geographic Sciences and Natural Resources Research, CAS, Beijing 100101, China;
    2. Satellite Environment Center, Ministry of Environmental Protection, Beijing 100094, China

Received date: 2011-04-02

  Revised date: 2011-07-20

  Online published: 2011-12-20

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Abstract

Exploring the distribution characteristics of soil organic carbon and its influencing factors under different degraded types of alpine slope grasslands was crucial to better understand the changes of soil organic carbon content and responses to global climate change. Two types of alpine grassland (alpine meadow and alpine steppe), and the impact mechanism of soil organic carbon were studied under the influences of external environment, such as water erosion, wind erosion, freezing-thawing erosion and rodent damage in the "Three-River Headwaters" region. The results showed that: the contents of soil organic carbon of alpine meadow dominated by Kobresia pygmaea and Kobresia humilis were higher than alpine steppe dominated by Stipa purpurea Griseb. Under the conditions of the lightly degraded and water erosion, the average content of alpine meadow QMH1 was 2.2 times (P<0.01) of alpine steppe QMH2 which was 3.5 km away from QMH1. And it was similar to the conditions of the lightly degraded and wind erosion, the average content of alpine meadow WDL was 3.8 times (P<0.01) of alpine steppe BDQ. Under the influence of water erosion, the soil organic carbon of alpine grassland was transferred downward along the slope grassland. The soil organic carbon content of lower slope (downward 580 m distance from the top slope ) of alpine meadow ML1 was 22% higher (P<0.05)than the upper slope (upward 580 m distance from the top slope). The overlying distribution characteristics of soil organic carbon for ML2 alpine meadow was performed, not only decreased with the increase of degradation, but also migrated downward along the slope grassland due to water erosion. The soil organic carbon content of extremely degraded grassland, located on the lower slope compared with severely degraded grassland, was 49.3% (P<0.05) higher than severely degraded grassland for ML2 alpine meadow. Wind erosion made rough the soil surface of grassland and accelerated mineralization of soil organic carbon. The average content of soil organic carbon of ELH lightly impacted by lake breeze was 27.9% higher than ZLH (P<0.05) strongly impacted by lake breeze. The soil organic carbon content was reduced by freeze-thaw erosion, but the difference was not significant. Rodent damage not only reduced the content of soil organic carbon, but also accelerated deterioration of grassland, the average content of soil organic carbon of moderate degradation SDⅠ-Ⅲ around the rat holes were 2.1 time of the extremely degraded grassland SDⅣ-Ⅵ; and the average content of soil organic carbon of the moderately degraded grassland ML2Ⅰ-Ⅱ away from rat holes was 1.6 times of the extremely degraded grassland ML2Ⅳ-Ⅵ. The soil organic carbon of alpine slope grassland was aggravated due to influence by wind erosion, water erosion, freeze-thaw and rodent damage.

Key words： alpine degraded grassland; soil organic carbon; water erosion; wind erosion; freeze-thaw erosion; rodent damage

Cite this article

SUN Wen-yi, SHAO Quan-qin, LIU Ji-yuan, XIAO Tong . The Variation Characteristics of Soil Organic Carbon of Typical Alpine Slope Grasslands and Its Influencing Factors in the "Three-River Headwaters" Region[J]. JOURNAL OF NATURAL RESOURCES, 2011 , 26(12) : 2072 -2087 . DOI: 10.11849/zrzyxb.2011.12.007

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